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How did copper get this designation? Why'd they pick those 3 letters, do they stand for something?

"K" extra heavy, "L" medium "M" light (they BE TALKIN WALL THICKNESS)

The internal diameter changes BUT not the outside diameter

To keep it in simpleton language lets think type schedule 10 THIN (steel) wall pipe Then schedule 40 standard then 80 Extra heavy and then 120 EXTRA EXTRA heavy used in very high pressure applications ( That will be discussed in class THREE)

Why made you think THREE?

What about DWV and ACR (TYPE G) don't they count ?? how about type T.P Copper

K tubing normally used under ground L above ground M = heating and in poor code area's they do use M for water distribution

Then there is bending often called HARD (Drawn Temper) and there is annealed known as SOFT temper and Both can be soldered, brazed or welded

Tubing in the bending or soft temper can also be joined by flare.

Amazing what a FIRST YEAR apprentice learns

Class TWO

We will discuss "color coding" of the various copper tube designations EXCEPT ACR which does NOT have a color code

Ridgid makes amazing tools for soldering and swedging and flaring.

Depending on which "temper" one orders what its limitation and pluses are.

Comment

Thanks for the lesson, but I think most all of us already know what the designations are;

The question was where the designation came from being. Why were those letters chosen??

regards

ABC was taken by the NFPA

Class A fire anything that leaves an ASH

Class B fire is liquid fuels like gasoline or oils, etc

Class C is electrical

and there is a Magnesium which was supposed to have a D classification BUT seeing as how these fires cannot be put out with conventional fire suppression systems I think they forgo the D and just pray that no one tries to use water to put it out

Then there were the letters NBC (nuclear, biological and chemical) warfare

Then other associations took letters like ASME,ASTM,NFPA,NAPHCC,ASSE,ASE,API,AGA,GAMA,ADA,OS HA,NIOSH,CS,CC
CS,FS and a host of others so the CDA just took what they could before they all were used up

To discover I was wrong, Sylvan was right and Crack already posted the homepage link above. (I'll never be right)I say Sylvans ugly and his mommy dresses him funny though, so there.I was told years ago that copper was rated alphabetically, and now it's in writing, that was incorrect info.

As for the tutorial on DC central...not sure where that came from, but I had the enjoyable occasion to don an OBA and stand behind the spray in my share of training back in the day.